Thanks for your references Decker, the condition is it cost close to three times time after i use CMake than already exist makefile to build project. And i found the CPU didn't use effectively than exist make flow, so i wonder if CMake provide some options to use CPU more effectively. Thanks, Chao
J Decker wrote > On Tue, Jul 12, 2016 at 7:54 PM, Chaos Zhang < > zcsd2012@ > > wrote: > >> Hi, all, >> >> I was trying to compile my project using CMake, after CMake generated >> Makefile. >> I used `/usr/bin/time -v make` to make the Makefile, got the result: >> 'Percent of CPU this job got: 96%'. >> Then i used `/usr/bin/time -v make -j8` to make the Makefile, the result >> of >> CPU used is 'Percent of CPU this job got: 648%'. >> So i wonder if Makefile generated by CMake support make -jN, BTW my CPU >> is >> I7-4790, and after i use 'cat /proc/cpuinfo', there are 8 processors. >> >> > All the sources, headers, etc come from the IO system, from the disk, > probably you're running into the bottleneck of how long it takes to move > the memory for the compiler to do work on? did you profile IO ? > > >> Thanks a lot, >> Chao >> >> >> >> -- >> View this message in context: >> http://cmake.3232098.n2.nabble.com/Does-Makefile-generated-by-CMake-support-make-jN-tp7593949.html >> Sent from the CMake mailing list archive at Nabble.com. >> -- >> >> Powered by www.kitware.com >> >> Please keep messages on-topic and check the CMake FAQ at: >> http://www.cmake.org/Wiki/CMake_FAQ >> >> Kitware offers various services to support the CMake community. For more >> information on each offering, please visit: >> >> CMake Support: http://cmake.org/cmake/help/support.html >> CMake Consulting: http://cmake.org/cmake/help/consulting.html >> CMake Training Courses: http://cmake.org/cmake/help/training.html >> >> Visit other Kitware open-source projects at >> http://www.kitware.com/opensource/opensource.html >> >> Follow this link to subscribe/unsubscribe: >> http://public.kitware.com/mailman/listinfo/cmake >> > > -- > > Powered by www.kitware.com > > Please keep messages on-topic and check the CMake FAQ at: > http://www.cmake.org/Wiki/CMake_FAQ > > Kitware offers various services to support the CMake community. For more > information on each offering, please visit: > > CMake Support: http://cmake.org/cmake/help/support.html > CMake Consulting: http://cmake.org/cmake/help/consulting.html > CMake Training Courses: http://cmake.org/cmake/help/training.html > > Visit other Kitware open-source projects at > http://www.kitware.com/opensource/opensource.html > > Follow this link to subscribe/unsubscribe: > http://public.kitware.com/mailman/listinfo/cmake -- View this message in context: http://cmake.3232098.n2.nabble.com/Does-Makefile-generated-by-CMake-support-make-jN-tp7593949p7593954.html Sent from the CMake mailing list archive at Nabble.com. -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: http://public.kitware.com/mailman/listinfo/cmake
